HD6435348R Hitachi Semiconductor, HD6435348R Datasheet - Page 176

• Manufacturer Part Number: HD6435348R
• Description: Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

9.6 Port 5
9.6.1 Overview
Port 5 is an 8-bit input/output port with the pin configuration shown in figure 9-11. In the
expanded modes that use the on-chip ROM (modes 2 and 4), the pins of port 5 function either as
general-purpose input pins or as bits A
direction register (P5DDR).
Port 5 has built-in MOS pull-ups that can be turned on or off under program control.
Outputs from port 5 can drive one TTL load and a 90 pF capacitive load. They can also drive a
Darlington transistor pair.
Port
5
Pin
P5
P5
P5
P5
P5
P5
P5
P5
7
6
5
4
3
2
1
0
Figure 9-10 Port 4 Pin Functions in Single-Chip Mode
/ A
/ A
/ A
/ A
/ A
/ A
/ A
/ A
15
14
13
12
11
10
9
8
Port
4
Modes 1 and 3
A
A
A
A
A
A
A
A
Figure 9-11 Pin Functions of Port 5
15
14
13
12
11
10
9
8
(output)
(output)
(output)
(output)
(output)
(output)
(output)
(output)
15
– A
P4
P4
P4
P4
P4
P4
P4
P4
8
7
6
5
4
3
2
1
0
of the address bus, depending on the port 5 data
159
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
Modes 2 and 4
P5
P5
P5
P5
P5
P5
P5
P5
7
6
5
4
3
2
1
0
(input) / A
(input) / A
(input) / A
(input) / A
(input) / A
(input) / A
(input) / A
(input) / A
15
14
13
12
11
10
9
8
(output)
(output)
(output)
(output)
(output)
(output)
(output)
(output)
Single-Chip Mode
P5
P5
P5
P5
P5
P5
P5
P5
7
6
5
4
3
2
1
0
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)